EP2037528A1 - Cellule solaire sensible à la coloration - Google Patents
Cellule solaire sensible à la coloration Download PDFInfo
- Publication number
- EP2037528A1 EP2037528A1 EP07768129A EP07768129A EP2037528A1 EP 2037528 A1 EP2037528 A1 EP 2037528A1 EP 07768129 A EP07768129 A EP 07768129A EP 07768129 A EP07768129 A EP 07768129A EP 2037528 A1 EP2037528 A1 EP 2037528A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- fine particles
- oxide semiconductor
- semiconductor fine
- solar cell
- dye
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Ceased
Links
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- 239000000758 substrate Substances 0.000 claims abstract description 116
- 239000010409 thin film Substances 0.000 claims abstract description 90
- 238000010521 absorption reaction Methods 0.000 claims abstract description 44
- 150000003839 salts Chemical class 0.000 claims abstract description 20
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- 239000010419 fine particle Substances 0.000 claims description 138
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- 238000006243 chemical reaction Methods 0.000 claims description 93
- 239000011777 magnesium Substances 0.000 claims description 62
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- 150000001342 alkaline earth metals Chemical class 0.000 claims description 19
- 229910052784 alkaline earth metal Inorganic materials 0.000 claims description 18
- 229910044991 metal oxide Inorganic materials 0.000 claims description 18
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- 229910052723 transition metal Inorganic materials 0.000 claims description 17
- 150000003624 transition metals Chemical class 0.000 claims description 17
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- IEQIEDJGQAUEQZ-UHFFFAOYSA-N phthalocyanine Chemical compound N1C(N=C2C3=CC=CC=C3C(N=C3C4=CC=CC=C4C(=N4)N3)=N2)=C(C=CC=C2)C2=C1N=C1C2=CC=CC=C2C4=N1 IEQIEDJGQAUEQZ-UHFFFAOYSA-N 0.000 description 1
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- 239000002243 precursor Substances 0.000 description 1
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- 239000000047 product Substances 0.000 description 1
- ZGSOBQAJAUGRBK-UHFFFAOYSA-N propan-2-olate;zirconium(4+) Chemical compound [Zr+4].CC(C)[O-].CC(C)[O-].CC(C)[O-].CC(C)[O-] ZGSOBQAJAUGRBK-UHFFFAOYSA-N 0.000 description 1
- BJDYCCHRZIFCGN-UHFFFAOYSA-N pyridin-1-ium;iodide Chemical compound I.C1=CC=NC=C1 BJDYCCHRZIFCGN-UHFFFAOYSA-N 0.000 description 1
- 150000003242 quaternary ammonium salts Chemical class 0.000 description 1
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- 229910052703 rhodium Inorganic materials 0.000 description 1
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- MHOVAHRLVXNVSD-UHFFFAOYSA-N rhodium atom Chemical compound [Rh] MHOVAHRLVXNVSD-UHFFFAOYSA-N 0.000 description 1
- 150000003303 ruthenium Chemical class 0.000 description 1
- HFHDHCJBZVLPGP-UHFFFAOYSA-N schardinger α-dextrin Chemical compound O1C(C(C2O)O)C(CO)OC2OC(C(C2O)O)C(CO)OC2OC(C(C2O)O)C(CO)OC2OC(C(O)C2O)C(CO)OC2OC(C(C2O)O)C(CO)OC2OC2C(O)C(O)C1OC2CO HFHDHCJBZVLPGP-UHFFFAOYSA-N 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
- NRHMKIHPTBHXPF-TUJRSCDTSA-M sodium cholate Chemical compound [Na+].C([C@H]1C[C@H]2O)[C@H](O)CC[C@]1(C)[C@@H]1[C@@H]2[C@@H]2CC[C@H]([C@@H](CCC([O-])=O)C)[C@@]2(C)[C@@H](O)C1 NRHMKIHPTBHXPF-TUJRSCDTSA-M 0.000 description 1
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- HXJUTPCZVOIRIF-UHFFFAOYSA-N sulfolane Chemical compound O=S1(=O)CCCC1 HXJUTPCZVOIRIF-UHFFFAOYSA-N 0.000 description 1
- 125000005207 tetraalkylammonium group Chemical group 0.000 description 1
- GKXDJYKZFZVASJ-UHFFFAOYSA-M tetrapropylazanium;iodide Chemical compound [I-].CCC[N+](CCC)(CCC)CCC GKXDJYKZFZVASJ-UHFFFAOYSA-M 0.000 description 1
- HPGGPRDJHPYFRM-UHFFFAOYSA-J tin(iv) chloride Chemical compound Cl[Sn](Cl)(Cl)Cl HPGGPRDJHPYFRM-UHFFFAOYSA-J 0.000 description 1
- JMXKSZRRTHPKDL-UHFFFAOYSA-N titanium ethoxide Chemical compound [Ti+4].CC[O-].CC[O-].CC[O-].CC[O-] JMXKSZRRTHPKDL-UHFFFAOYSA-N 0.000 description 1
- XJDNKRIXUMDJCW-UHFFFAOYSA-J titanium tetrachloride Chemical compound Cl[Ti](Cl)(Cl)Cl XJDNKRIXUMDJCW-UHFFFAOYSA-J 0.000 description 1
- PMTRSEDNJGMXLN-UHFFFAOYSA-N titanium zirconium Chemical compound [Ti].[Zr] PMTRSEDNJGMXLN-UHFFFAOYSA-N 0.000 description 1
- ZIBGPFATKBEMQZ-UHFFFAOYSA-N triethylene glycol Chemical compound OCCOCCOCCO ZIBGPFATKBEMQZ-UHFFFAOYSA-N 0.000 description 1
- AAAQKTZKLRYKHR-UHFFFAOYSA-N triphenylmethane Chemical compound C1=CC=CC=C1C(C=1C=CC=CC=1)C1=CC=CC=C1 AAAQKTZKLRYKHR-UHFFFAOYSA-N 0.000 description 1
- 229910052724 xenon Inorganic materials 0.000 description 1
- FHNFHKCVQCLJFQ-UHFFFAOYSA-N xenon atom Chemical compound [Xe] FHNFHKCVQCLJFQ-UHFFFAOYSA-N 0.000 description 1
- 239000004246 zinc acetate Substances 0.000 description 1
- 229960000314 zinc acetate Drugs 0.000 description 1
- 235000013904 zinc acetate Nutrition 0.000 description 1
- 239000011592 zinc chloride Substances 0.000 description 1
- 235000005074 zinc chloride Nutrition 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L31/00—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L31/04—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof adapted as photovoltaic [PV] conversion devices
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G9/00—Electrolytic capacitors, rectifiers, detectors, switching devices, light-sensitive or temperature-sensitive devices; Processes of their manufacture
- H01G9/20—Light-sensitive devices
- H01G9/2068—Panels or arrays of photoelectrochemical cells, e.g. photovoltaic modules based on photoelectrochemical cells
- H01G9/2072—Panels or arrays of photoelectrochemical cells, e.g. photovoltaic modules based on photoelectrochemical cells comprising two or more photoelectrodes sensible to different parts of the solar spectrum, e.g. tandem cells
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G9/00—Electrolytic capacitors, rectifiers, detectors, switching devices, light-sensitive or temperature-sensitive devices; Processes of their manufacture
- H01G9/20—Light-sensitive devices
- H01G9/2027—Light-sensitive devices comprising an oxide semiconductor electrode
- H01G9/2036—Light-sensitive devices comprising an oxide semiconductor electrode comprising mixed oxides, e.g. ZnO covered TiO2 particles
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M14/00—Electrochemical current or voltage generators not provided for in groups H01M6/00 - H01M12/00; Manufacture thereof
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G9/00—Electrolytic capacitors, rectifiers, detectors, switching devices, light-sensitive or temperature-sensitive devices; Processes of their manufacture
- H01G9/20—Light-sensitive devices
- H01G9/2027—Light-sensitive devices comprising an oxide semiconductor electrode
- H01G9/2031—Light-sensitive devices comprising an oxide semiconductor electrode comprising titanium oxide, e.g. TiO2
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G9/00—Electrolytic capacitors, rectifiers, detectors, switching devices, light-sensitive or temperature-sensitive devices; Processes of their manufacture
- H01G9/20—Light-sensitive devices
- H01G9/2059—Light-sensitive devices comprising an organic dye as the active light absorbing material, e.g. adsorbed on an electrode or dissolved in solution
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G9/00—Electrolytic capacitors, rectifiers, detectors, switching devices, light-sensitive or temperature-sensitive devices; Processes of their manufacture
- H01G9/20—Light-sensitive devices
- H01G9/2059—Light-sensitive devices comprising an organic dye as the active light absorbing material, e.g. adsorbed on an electrode or dissolved in solution
- H01G9/2063—Light-sensitive devices comprising an organic dye as the active light absorbing material, e.g. adsorbed on an electrode or dissolved in solution comprising a mixture of two or more dyes
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K85/00—Organic materials used in the body or electrodes of devices covered by this subclass
- H10K85/30—Coordination compounds
- H10K85/341—Transition metal complexes, e.g. Ru(II)polypyridine complexes
- H10K85/344—Transition metal complexes, e.g. Ru(II)polypyridine complexes comprising ruthenium
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K85/00—Organic materials used in the body or electrodes of devices covered by this subclass
- H10K85/60—Organic compounds having low molecular weight
- H10K85/649—Aromatic compounds comprising a hetero atom
- H10K85/652—Cyanine dyes
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/542—Dye sensitized solar cells
Definitions
- the present invention relates to a photoelectric conversion element for a specific wavelength region comprising a dye having a maximum absorption wavelength in a specific wavelength region supported on a thin film, which is provided on a substrate, of oxide semiconductor fine particles optimized for that dye, and a solar cell (Gratzel cell) which uses a combination of at least 2 such elements.
- Patent Document 1 As a means for resolving the above-described problems, a tandem cell which supports a plurality of dyes on a single oxide semiconductor (Patent Document 3), or a photocell in which the photoelectric conversion layer is a two-layer structure (Patent Documents 4 and 4) has been proposed. However, the problems have not yet been resolved.
- Patent Document 1 Japanese Patent No. 2664194 Patent Document 2: WO 2002/011213 Patent Document 3: JP-A-2003-504799 Patent Document 4: JP-A-11-273753 Patent Document 5: JP-A-2001-167808
- Non-patent Document 1 B. O'Regan et al., Nature, 353, 737 (1991 )
- Non-patent Document 2 M. K. Nazeeruddin et al., J. Am. Chem. Soc., 115, 6382 (1993 )
- Non-patent Document 3 W. Kubo et al., Chem. Lett. 1241 (1998 )
- the present inventors discovered that these problems can be resolved by fabricating a photoelectric conversion element which uses a dye that efficiently absorbs a specific wavelength region, and an oxide semiconductor which is optimized to this dye, and combining a plurality of these photoelectric conversion elements, thereby completing the present invention.
- the present invention relates to:
- a solar cell having a high conversion efficiency, especially, a high conversion efficiency in the short-wavelength region and in the long-wavelength region, can be provided.
- the solar cell according to the present invention is characterized by using a combination of at least 2 photoelectric conversion elements for a specific wavelength region, each comprising a dye or a salt thereof having a maximum absorption wavelength in a specific wavelength region on a thin film, provided on a substrate, of oxide semiconductor fine particles optimal for that dye.
- the term "compound” represents a compound or salt thereof.
- Specific wavelength region refers to 3 regions of a short-wavelength region, a medium-wavelength region, and a long-wavelength region. While it is difficult to completely classify these wavelength regions, as one example, they can be classified as follows. Specifically, the short-wavelength region is usually less than 550 nm, strictly speaking the range of 200 to 500 nm, more strictly speaking the range of 300 to 500 nm, and particularly strictly speaking the range of 300 to 450 nm.
- the medium-wavelength region is the range of 400 to 900 nm, strictly speaking the range of 400 to 850 nm, more strictly speaking the range of 450 to 800 nm, and particularly strictly speaking the range of 450 to 750 nm.
- the long-wavelength region is the region of wavelengths of 700 nm or longer, strictly speaking the region of wavelengths of 750 nm or longer, and more strictly speaking the region of wavelengths of 750 nm or longer.
- any dye may be used as long as it has a maximum absorption wavelength in the above-described wavelength regions.
- Metal complex dyes which may be used are not especially limited. Preferred examples thereof include the ruthenium complexes disclosed in Non Patent Document 2 and ternary salts thereof, phthalocyanine, and porphyrin.
- organic dyes which may be used include metal-free phthalocyanines and porphyrins, cyanine, melocyanine, oxonol, triphenylmethane dyes, methine dyes such as the acrylic acid dyes described in Patent Document 2, xanthene, azo, anthraquinone, and perylene dyes.
- dyes which can be used in the solar cell according to the present invention include, as methine dyes, the methine dyes described in WO 2002-011213 , WO 2004-082061 , International Patent Application No. PCT/JP/2007/053885 , JP-A-2002-334729 , JP-A-2003-007358 , JP-A-2003-017146 , JP-A-2003-059547 , JP-A-2003-086257 , JP-A-2003-115333 , JP-A-2003-132965 , JP-A-2003-142172 , JP-A-2003-151649 , JP-A-2003-157915 , JP-A-2003-282165 , JP-A-2004-014175 , JP-A-2004-022222 , JP-A-2004-022387 , JP-A-2004-227825 , JP-A-2005-005026 , JP-A-
- examples of metal complex dyes included the complex dyes described in JP-A-2000-026487 , JP-A-2000-268889 , JP-A-2000-268890 , JP-A-2001-006760 , JP-A-2001-039995 , JP-A-2001-059062 , JP-A-2001-060467 , JP-A-2001-060468 , JP-A-2001-203005 , JP-A-2001-226607 , JP-A-2001-229983 , JP-A-2001-236999 , JP-A-2001-237000 , JP-A-2001-247546 , JP-A-2001-247546 , JP-A-2001-253894 , JP-A-2001-291534 , JP-A-2002-025636 , JP-A-2002-093473 , JP-A-2002-093474 , JP-A-2002-100417 ,
- examples of dyes which are preferred as a dye for the short-wavelength range include, among the dyes described in the above publications describing examples of methine dyes, those which, when dissolved in a polar solvent such as an alcohol, tetrahydrofuran, dimethylformamide, water, or chloroform, have a maximum absorption wavelength ( ⁇ max) located in the region of less than 550 nm, preferably 200 to 500 nm, and more preferably 300 to 500 nm.
- a polar solvent such as an alcohol, tetrahydrofuran, dimethylformamide, water, or chloroform
- examples of dyes which are preferred as a dye for the medium-wavelength range include, among the dyes described in the above publications describing examples of methine dyes, publications describing examples of metal complex dyes, and publications describing examples of dyes other than those in the publications describing examples of methine dyes and metal complex dyes, those which, when dissolved in a polar solvent such as an alcohol, tetrahydrofuran, dimethylformamide, water, or chloroform, have a maximum absorption wavelength ( ⁇ max) located in the region of 400 to 900 nm, preferably 400 to 850 nm, more preferably 450 to 800 nm, and especially preferably 450 to 750 nm.
- a polar solvent such as an alcohol, tetrahydrofuran, dimethylformamide, water, or chloroform
- examples of dyes which are preferred as a dye for the long-wavelength range include, among the dyes described in the above publications describing examples of methine dyes, publications describing examples of metal complex dyes, and publications describing examples of dyes other than those in the publications describing examples of methine dyes and metal complex dyes, those which, when dissolved in a polar solvent such as an alcohol, tetrahydrofuran, dimethylformamide, water, or chloroform, have a maximum absorption wavelength ( ⁇ max) located in the region of long wavelengths of 700 nm or more, preferably 750 nm or more, and more preferably more than 750 nm.
- a polar solvent such as an alcohol, tetrahydrofuran, dimethylformamide, water, or chloroform
- the methine dyes described in WO 2002-011213 , WO 2004-082061 , International Patent Application No. PCT/JP/2007/053885 and the like and the phthalocyanine dyes described in JP-A-2000-243464 and the like, and the cyanine dyes described in JP-A-2000-235874 and the like are preferred.
- a solar cell may also be fabricated in which, in addition to the above-described dyes having a maximum absorption wavelength in the respective short-wavelength region, medium-wavelength region, and long-wavelength region, a photoelectric conversion element which uses a dye having a maximum absorption wavelength in a boundary region between the respective wavelength regions is further combined. Further, a photoelectric conversion element including a plurality of dye kinds having different maximum absorption wavelengths in the respective regions supported on one semiconductor, or a plurality of photoelectric conversion elements each including one kind of a plurality of dye kinds having different maximum absorption wavelengths supported on the semiconductor, may be fabricated and used in combination.
- the semiconductor material (metal kind) or combination of materials (metal kinds) suitable for the dye depends on the kind or chemical structure of the dye even for dyes having a maximum absorption wavelength in the same wavelength region, in the present invention it is preferred to use the latter-described photoelectric conversion element.
- oxide semiconductors include composite oxides of titanium oxide with an oxide semiconductor, such as composite oxides of titanium oxide with an alkaline earth metal and titanium oxide with a transition metal, or composite oxide semiconductors of titanium oxide with a metal oxide such as zinc oxide, tin oxide and the like.
- Preferred examples of composite oxide semiconductors of titanium oxide with another metal oxide which complexes therewith include composite oxide semiconductors of titanium oxide with the respective oxide of Zr (zirconium), Mg (magnesium), Ca (calcium), Sr (strontium), Ba (barium), Nb (niobium), V (vanadium), Zn (zinc), Sn (tin), Fe (Iron), Ge (germanium), W (tungsten), and Mo (molybdenum).
- oxide semiconductors especially preferred for the short-wavelength region are composite oxides of Ti-Zr, Ti-Mg, Ti-Ca, and Ti-Nb.
- oxide semiconductor for the medium-wavelength region is titanium oxide.
- oxide semiconductor for the long-wavelength region are composite oxides of titanium oxide with an oxide of Nb, V, Zn, Sn, Fe, Ge, W, Mo, Ni, Sb and the like, rutile-type titanium oxide, and zinc oxide.
- An optimal combination of these oxide semiconductors may be preferably used by combining with the selected dye (e.g., combining an above-described oxide semiconductor for the short-wavelength region with an above-described dye for the short-wavelength region, combining an oxide semiconductor for the medium-wavelength region with an above-described dye for the medium-wavelength region, and combining an above-described oxide semiconductor for the long-wavelength region with an above-described dye for the long-wavelength region).
- the selected dye e.g., combining an above-described oxide semiconductor for the short-wavelength region with an above-described dye for the short-wavelength region, combining an oxide semiconductor for the medium-wavelength region with an above-described dye for the medium-wavelength region, and combining an above-described oxide semiconductor for the long-wavelength region with an above-described dye for the long-wavelength region.
- An example of an index for the optimization is the relationship between the conductor level of the semiconductor and the LUMO (lowest unoccupied molecular orbital)
- the LUMO level of the dye must be higher than the conductor level of the semiconductor, if it is too high the energy loss is large, and photoelectric conversion cannot be carried out efficiently. In many cases photoelectric conversion can be carried out efficiently by making the LUMO level and the conductor level closer to each other.
- the mixing ratio between the titanium oxide and the other material is usually, in terms of the oxide and by mass ratio, 99:1 to 60:40, preferably 98:2 to 70:30, and especially preferably 95:5 to 75:25.
- the solar cell according to the present invention is, for example, characterized by using a combination of at least 2 photoelectric conversion elements for a specific wavelength region comprising a dye or a salt thereof having a maximum absorption wavelength in a specific wavelength region supported on a thin film of oxide semiconductor fine particles provided on a substrate.
- the substrate on which the thin film of oxide semiconductor fine particles is provided preferably has a conductive surface. Such a substrate can be easily obtained commercially.
- substrates provided with a thin film of a conductive metal oxide, such as tin oxide, doped with indium, fluorine or antimony, or thin film of a metal such as copper, silver, and gold, on a glass surface or the surface of a transparent polymer material such as polyethylene terephthalate or polyethersulfone, can be used.
- the conductivity may usually be 1000 ⁇ or less, and 100 ⁇ or less is especially preferred.
- a metal oxide is preferred for the fine particles of the oxide semiconductor.
- Preferred specific examples thereof include fine particles of the above-described oxide semiconductors.
- An above-described oxide semiconductor may also be used by additionally coating on the surface of the semiconductor.
- the average particle size of the fine particles of the oxide semiconductor is usually 1 to 500 nm, and preferably 1 to 100 nm.
- the fine particles of the oxide semiconductor may also be used in the form of a mixture of particles having a large particle size and particles having a small particle size, and in a multi-layer form.
- the thin film of oxide semiconductor fine particles may be produced by a method in which the oxide semiconductor fine particles are directly formed on a substrate as a thin film of semiconductor fine particles by spraying etc., a method in which the semiconductor fine particles are electrically deposited in a thin film form using the substrate as an electrode, or a method in which a slurry of semiconductor fine particles or a paste containing fine particles obtained by hydrolyzing a precursor of the semiconductor fine particles, such as a semiconductor alkoxide, is coated on the substrate, then dried, hardened, or baked.
- the method in which a slurry is used is preferred.
- the slurry may be obtained by dispersing secondary-agglomerated oxide semiconductor fine particles by a typical method in a dispersion medium so that the average primary particle size is 1 to 200 nm.
- the dispersion medium dispersing slurry therein may be any medium which can disperse semiconductor particles. Examples thereof which may be used include water, alcohols such as ethanol and terpineol, ketones such as acetone and acetylacetone, and hydrocarbons such as hexane. These mediums may be used as a mixture. Water is preferred from the standpoint that it reduces the change in viscosity of the slurry. Further, in order to stabilize the dispersion state of the oxide semiconductor fine particles, a dispersion stabilizer can be used.
- dispersion stabilizers examples include an acid such as acetic acid, hydrochloric acid, and nitric acid, or an organic solvent such as acetylacetone, acrylic acid, polyethylene glycol, polyvinyl alcohol and the like.
- the substrate coated with the slurry may be baked.
- the baking temperature is usually 100°C or more, and preferably 200°C or more.
- the upper limit thereof is roughly the melting point (softening point) of the substrate or less.
- the upper limit is 900°C, and preferably 600°C or less.
- the baking time is not especially limited, within about 4 hours is preferable.
- the thickness of the thin film on the substrate is usually 1 to 200 ⁇ m, and preferably 1 to 50 ⁇ m.
- the thin film of oxide semiconductor fine particles may be subjected to a secondary treatment. Specifically, for example, by directly dipping the whole substrate on which the thin film of oxide semiconductor fine particles is provided, in a solution of an alkoxide, metal acyloxide, chloride, nitrate, sulfate and the like of the same metal as the semiconductor, and then drying or re-baking, the performance of the thin film of semiconductor fine particles can be improved.
- the metal alkoxide include titanium ethoxide, titanium isopropoxide, and titanium t-butoxide.
- the metal acyloxide include n-dibutyl-diacetyl tin.
- An alcohol solution thereof may be used.
- An acetate or chloride may also be used.
- Examples of the chloride include titanium tetrachloride, tin tetrachloride, and zinc chloride.
- An aqueous solution thereof may be used.
- magnesium acetate, calcium acetate, zinc acetate and the like may be used.
- the thus-obtained oxide semiconductor thin film is constituted of fine particles of the oxide semiconductor.
- Examples of the method for supporting the dye include dipping the substrate on which the above-described thin film of oxide semiconductor fine particles is provided in a solution obtained by dissolving the dye in a solvent in which it can dissolve, or in a dispersion obtained by dispersing the dye if the dye has low solubility.
- the concentration in the solution or dispersion is appropriately determined according to the dye.
- the thin film of semiconductor fine particles fabricated on a substrate is dipped into this solution.
- the dipping temperature is from about room temperature to boiling point of the solvent.
- the dipping time is from about 1 minute to 48 hours.
- solvents which can be used to dissolve the dye include methanol, ethanol, acetonitrile, dimethylsulfoxide, dimethylformamide, acetone, and t-butanol.
- the dye concentration in the solution is usually 1 ⁇ 10 -6 M to 1 M, and preferably 1 ⁇ 10 -5 M to 1 ⁇ 10 -1 M.
- the supported dye may be one kind, or a mixture of several kinds. By mixing dyes with different absorption wavelength regions within a specific wavelength region, in some cases a wider absorption wavelength region can be utilized than that for a single dye, so that a solar cell with high conversion efficiency can be obtained. When 2 or more kinds of dye are used, these dyes may be adsorbed sequentially on the thin film of semiconductor fine particles, or adsorbed after dissolving them by mixing.
- the ratio of the mixed dyes is not especially limited. Although the optimizing conditions are appropriately selected depending on the respective dyes, generally it is preferred to mix from equivalent molar ratios of each dye to a ratio of about 10 mole% or more per dye.
- the total concentration of the dyes in the solution may be the same as a case where only one kind of dye is supported.
- a solvent such as those as described above can be used.
- the solvent for each used dye may be the same or different.
- the inclusion compound include steroidal compounds such as cholic acid, crown ethers, cyclodextrin, calixarene, and polyethylene oxide.
- Preferred examples include cholic acids such as deoxycholic acid, dehydrodeoxycholic acid, chenodeoxycholic acid, methyl cholate, and sodium cholate, and polyethylene oxide.
- the thin film of semiconductor fine particles may be treated with an amine compound such as 4-t-butylpyridine.
- the method employed for such a treatment may be, for example, a method in which the substrate on which the thin film of semiconductor fine particles supporting the dye is provided is dipped in a solution of an amine in ethanol, or the like.
- the solar cell according to the present invention includes a photoelectric conversion element electrode comprising a dye on the above-described thin film of oxide semiconductor fine particles, a counter electrode, and a charge transport material formed from a redox electrolyte, a hole transport material, or a p-type semiconductor and the like.
- a photoelectric conversion element electrode comprising a dye on the above-described thin film of oxide semiconductor fine particles, a counter electrode, and a charge transport material formed from a redox electrolyte, a hole transport material, or a p-type semiconductor and the like.
- the form of the redox electrolyte, hole transport material, p-type semiconductor and the like include a liquid, an agglomerate (gel and gel-like), and a solid.
- liquid forms include a solution in which a redox electrolyte, a molten salt, a hole transport material, a p-type semiconductor and the like are respectively dissolved in a solvent, an ordinary-temperature molten
- Examples of agglomerate forms include an agglomerate in which they are included in a polymer matrix or a low molecular weight gelling agent and the like.
- the redox electrolyte, the molten salt, the hole transport material, the p-type semiconductor and the like may be used.
- hole transport materials include amine derivatives, conductive polymers such as polyacetylene, polyaniline, and polythiophene, and materials using a discotic liquid crystal phase such as a triphenylene compound.
- examples of p-type semiconductors include CuI and CuSCN.
- the counter electrode preferably is conductive and works as a catalyst to the reduction reaction of the redox electrolyte.
- Examples of counter electrodes which can be used include glass or a polymer film on which platinum, carbon, rhodium, ruthenium or the like are vapor-deposited, or conductive fine particles are applied.
- Examples of redox electrolytes used in the solar cell according to the present invention include a halogen redox electrolyte composed of a halogen molecule and a halogen compound having a halogen ion as a counter ion, a metal redox electrolyte of a metal complex or the like such as ferrocyanate-ferricyanate, ferrocene-ferricinium ion, and a cobalt complex, an organic redox electrolyte such as alkylthiol-alkyldisulfide, a viologen dye, and hydroquinone-quinone.
- a halogen redox electrolyte is preferred.
- Examples of the halogen molecule in the halogen redox electrolyte composed of a halogen compound-halogen molecule include an iodine molecule and a bromine molecule. An iodine molecule is preferred.
- examples of the halogen compounds having a halogen ion as a counter ion include a halogenated metal salt such as LiBr, NaBr, KBr, LiI, NaI, KI, CsI, CaI 2 , MgI 2 , and CuI, or an organic quaternary ammonium salt of a halogen such as tetraalkylammonium iodide, imidazolium iodide, and pyridinium iodide.
- a salt having an iodine ion as a counter ion is preferred.
- an electrolyte having an imide ion such as a bis(trifluoromethanesulfonyl)imide ion, a dicyanoimide ion as a counter ion may also be preferably used.
- an electrochemically inert solvent is used.
- examples include acetonitrile, propylene carbonate, ethylene carbonate, 3-methoxypropionitrile, methoxyacetonitrile, ethylene glycol, propylene glycol, diethylene glycol, triethylene glycol, ⁇ -butyrolactone, dimethoxyethane, diethyl carbonate, diethyl ether, diethyl carbonate, dimethyl carbonate, 1,2-dimethoxyethane, dimethylformamide, dimethylsulfoxide, 1,3-dioxolane, methyl formate, 2-methyltetrahydrofuran, 3-methyl-oxazolidin-2-one, sulfolane, tetrahydrofuran, and water.
- acetonitrile, propylene carbonate, ethylene carbonate, 3-methoxypropionitrile, methoxyacetonitrile, ethylene glycol, 3-methyl-oxazolidin-2-one, ⁇ -butyrolactone and the like are especially preferable.
- These solvents may be used alone or as a mixture of 2 or more kinds.
- examples of the gel-like electrolyte include a gel-like electrolyte having an electrolyte or an electrolytic solution in a matrix such as an oligomer or a polymer, and a gel-like electrolyte similarly having an electrolyte or an electrolytic solution in a low molecular weight gelling agent and the like, as described in Non-patent Document 3.
- the concentration of the redox electrolyte is usually 0.01 to 99 weight%, and preferably about 0.1 to 90 weight%.
- each of the charge transport materials with which these charge transport material layers are filled may be the same or different.
- the dyes and semiconductors for the short-wavelength region, the medium-wavelength region, and the long-wavelength region of the solar cell of the present invention each have different energy levels, it is preferred to use charge transport materials which is appropriately selected for each of these regions.
- a counter electrode and the electrode provided on a photoelectric conversion element where the dye is supported on the thin film of oxide semiconductor fine particles on the substrate are arranged so as to sandwich the thin film of oxide semiconductor fine particles.
- the solar cell is obtained by charging a solution containing the redox electrolyte into a gap therebetween.
- the present invention will now be described in more detail based on the following examples. However, the present invention is not limited to these examples.
- the term "part(s)” represents “part(s) by mass”.
- Maximum absorption wavelength was measured with a V-3150 spectrophotometer (manufactured by Shimadzu Corporation), and nuclear magnetic resonance was measured with a Gemini 300 (manufactured by Varian Inc.).
- the structural formulae of the CMY-003, CMO-007, and N719 used in the examples are represented below. N719 may be commercially purchased as a commercial product.
- CMY-003 and CMO-007 were synthesized according to Example 1 in WO 2002/011213 .
- the maximum absorption wavelengths of the above-described dyes in ethanol were as follows. Dye Maximum absorption wavelength (nm) N719 532 CMY-003 386 CMO-007 417
- Titanium isopropoxide (25 g) and magnesium acetate tetrahydrate (2.5 g) were suspended in 1,4-butanediol (130 mL).
- the resultant mixture was placed in an autoclave having a volume of 300 mL, and the autoclave was then sealed.
- the contents of the autoclave were purged with nitrogen, and then the temperature in the autoclave was increased by heating to 300°C. After 2 hours, the autoclave valve was opened while maintaining the temperature at 300°C to remove the solvent, whereby 7.0 g of semiconductor fine particles composed of an oxide semiconductor of titanium oxide and magnesium was obtained as a xerogel.
- Example 1 Various kinds of oxide semiconductor fine particles were obtained by the same procedures as in Example 1. These results including Example 1 are collectively shown in Table 1.
- "Other Material” represents the material corresponding to the magnesium acetate tetrahydrate in Example 1.
- the respective semiconductor fine particles obtained in Examples 1 to 9 were formed into a paste using terpineol. These pastes were coated on the conductive substance FTO of a conductive glass support (glass substrate), which is the conductive support of the solar cell. The coated substrates were baked for 30 minutes at 450°C to obtain a porous substrate. Further, porous substrates were also produced in the same manner using titanium oxide and zinc oxide individually. Next, the above-described CMY-003, CMO-007, and N719 dyes were dissolved in ethanol (EtOH) so as to each form a 3.2 ⁇ 10 -4 M solution.
- EtOH ethanol
- a porous substrate obtained in the above-described manner (a thin film of a semiconductor formed by baking porous titanium oxide on a transparent conductive glass electrode for 30 minutes at 450°C) was then dipped in this solution at room temperature (20°C) for 12 hours, so that the respective dyes were supported thereon.
- the substrate was washed with a solvent (ethanol), and then dried to obtain a photoelectric conversion element constituted of a thin film of dye-sensitized semiconductor fine particles.
- a photoelectric conversion element constituted of a thin film of dye-sensitized semiconductor fine particles On a substrate provided with the thus-obtained thin film of dye-sensitized semiconductor fine particles, conductive glass sputtered with platinum was fixed leaving a space of 20 micrometers in such way that a sputtered surface of the conductive glass was opposed to the thin film of semiconductor fine particles.
- electrolytic solution A a solution in which iodine/lithium iodide/1,2-dimethyl-3-n-propylimidazolium iodide/t-butylpyridine were dissolved in 3-methoxypropionitrile in concentrations of 0.1 M/0.1 M/0.6 M/1 M, respectively, was used, and as “electrolytic solution B", iodine/tetra-n-propylammonium iodide was prepared in ethylene carbonate/acetonitrile (4/6) in concentrations of 0.05 M/0.5 M, respectively.
- Each of the thus-obtained solar cells using the respective photoelectric conversion elements which form the solar cell according to the present invention had been tested about their performance under the following conditions.
- the size of the cell to be measured was 0.25 cm 2 in effective area.
- a light source of 100 mW/cm 2 was employed by using a 500 W xenon lamp through an AM (air mass passing through the atmosphere) 1.5 filter.
- Short-circuit current, open-circuit voltage, and conversion efficiency were measured using a Solar Simulator WXS-155S-10, AM 1.5 G (manufactured by Wacom Electric Co., Lid.). The measurement results are shown in Tables 2 to 4.
- Table 2 shows the test results of cells using N791; Table 3 shows the test results of cells using CMY-003, and Table 4 shows the test results of cells using CMO-007.
- the substrate numbers 1 to 9 listed in each table respectively denote that the porous substrates produced using the various kinds of oxide semiconductor fine particles prepared in the above Examples 1 to 9 were used.
- substrate numbers 10 and 11 respectively denote that porous substrates of titanium oxide and zinc oxide produced in the same manner were used.
- the light in the short-wavelength region is high energy, if the light in this region can be efficiently used, as a result a solar cell exhibiting high voltage can be obtained. Therefore, by respectively utilizing the voltage in the short-wavelength region, and the voltage and current in other wavelength regions, such as the medium-wavelength region, as well as the current in the long-wavelength region, which conventionally has been difficult to utilize, energy from a wider wavelength region can be efficiently acquired.
- the solar cell according to the present invention can be fabricated.
- Normal connection methods such as in series, parallel, series-parallel, may be utilized as the combination method.
- the structure may be formed so that high energy light is absorbed in order from the side nearer to the incident face of the light, for instance from the cell for the short-wavelength region, the cell for the medium-wavelength region, and then the cell for the long-wavelength region.
- the solar cell according to the present invention can efficiently utilize light in a wider wavelength region than that of conventional solar cells.
- the cell When making into a tandem solar cell, the cell is formed by combining photoelectric conversion elements for the short-wavelength region, the medium-wavelength region, and the long-wavelength region, or by combining solar cells having such photoelectric conversion elements.
- conductive glass sputtered with platinum is used as one of the electrodes, since the transmission of light is suppressed by such electrode, it becomes more difficult for the light to be transmitted beyond such electrode. Therefore, for a tandem solar cell, it is preferred to use a platinum mesh or a carbon mesh sputtered with platinum instead of using conductive glass sputtered with platinum.
- a solution (electrolytic solution) containing an electrolyte was injected into these respective spaces.
- electrolytic solution a solution in which iodine/lithium iodide/1,2-dimethyl-3-n-propylimidazolium iodide/t-butylpyridine were dissolved in 3-methoxypropionitrile in concentrations of 0.1 M/0.1 M/0.6 M/1 M, respectively, was used.
- the cell performance of the thus-obtained tandem solar cells according to the present invention was tested by the same test methods as described above. The results are shown in Table 5.
- NKC-001 Used for the dye having a maximum absorption wavelength in the long-wavelength region was NKC-001 represented by the following formula (2).
- the maximum absorption wavelength of NKC-001 in dichloroethane was 1060 nm.
- the sputtered face of a conductive glass sputtered with platinum was set leaving a space of 20 micrometers so as to oppose the other face of substrate number 12, that is, the face having a thin film of semiconductor fine particles of tin oxide, and it was fixed.
- electrolytic solution a solution in which iodine/lithium iodide/1,2-dimethyl-3-n-propylimidazolium iodide/t-butylpyridine were dissolved in 3-methoxypropionitrile in concentrations of 0.1 M/0.1 M/0.6 M/1 M, respectively, was used.
- tandem solar cells (2 cell type) were fabricated by respectively combining a photoelectric conversion element fabricated by supporting Dye a on the porous substrates with substrate numbers of 1 to 11 listed as “Substrate 2A”, and a photoelectric conversion element fabricated by supporting N719 as the dye on a porous substrate with substrate number 10. Further, the tandem solar cells (3 cell type) were similarly fabricated by respectively combining the photoelectric conversion element listed as “Substrate 2A”, and a photoelectric conversion element fabricated by respectively supporting N719 on the titanium oxide face and NKC-001 on the tin oxide face of the porous substrate with substrate number 12.
- Substrate 2A denotes a substrate used for a conductive glass support (substrate) having a thin film of oxide semiconductor fine particles, specifically, the above-described "first face”.
- the substrate number in Substrate 2A has the same meaning as above.
- “Dye a” means the dye which is supported on the thin film of oxide semiconductor fine particles.
- the substrate with substrate number 7 was fabricated using the oxide semiconductor fine particles prepared in the same manner as in the above-described Example 7.
- the ratio of the respective metals in the oxide semiconductor fine particles is, in terms of mass ratio of the respective metal atoms, about 2.4/1 for titanium to zirconium.
- the substrate with substrate number 8 was 1.2/1 for titanium to zirconium.
- a paste formed from oxide semiconductor fine particles was coated on the conductive substance FTO of a conductive glass support (1).
- the coated substrate was baked for 30 minutes at 450°C, and then dipped into a 3.2 ⁇ 10 -4 M solution of a dye for 24 hours to produce a thin film (2) of oxide semiconductor fine particles supporting the dye.
- Pt was vapor-deposited to 20 angstrom on the conductive substance FTO of a conductive glass support (1) to produce a platinum electrode (3). They were pasted to each other by using a sealing agent (5), and an iodine charge transport layer (4) was charged between (2) and (3) from an injection aperture (not shown) of the charge transport layer (4) between both electrodes. Then, the injection aperture was sealed with a sealant to obtain the solar cell (A) according to the present invention.
- a paste formed from first oxide semiconductor fine particles was coated on the conductive substance FTO of a conductive glass support (1).
- the coated substrate was dried for 30 minutes at 170°C, and then a paste formed from second oxide semiconductor fine particles was coated thereon.
- the coated substrate was baked for 30 minutes at 450°C, and then dipped into a 3.2 ⁇ 10 -4 M solution of a first dye and a 3.2 ⁇ 10 -4 M solution of a second dye for 24 hours each to produce a thin film (2a) of the first oxide semiconductor fine particles supporting the first dye and a thin film (2b) of the second oxide semiconductor supporting the second dye.
- Pt was vapor-deposited to 20 angstrom on the conductive substance FTO of a conductive glass support (1) to produce a platinum electrode (3). They were pasted to each other by a sealing agent (5), and an iodine charge transport layer (4) was charged between (2) and (3) from an injection aperture (not shown) of the charge transport layer (4) between both electrodes. Then, the injection aperture was sealed with a sealant to obtain the solar cell (B) according to the present invention.
- a paste formed from first oxide semiconductor fine particles was coated on the conductive substance FTO of a conductive glass support (1).
- the coated substrate was dried for 30 minutes at 170°C, and then a paste formed from second oxide semiconductor fine particles was coated thereon.
- the coated substrate was dried for 30 minutes at 170°C, and then a paste formed from third oxide semiconductor fine particles was coated thereon.
- the coated substrate was baked for 30 minutes at 450°C, and then dipped into a 3.2 ⁇ 10 -4 M solution of a first dye, a 3.2 ⁇ 10 -4 M solution of a second dye, and a 3.2 ⁇ 10 -4 M solution of a third dye for 24 hours each to produce a thin film (2a) of the first oxide semiconductor fine particles supporting the first dye, a thin film (2b) of the second oxide semiconductor supporting the second dye, and a thin film (2c) of the third oxide semiconductor fine particles supporting the third dye.
- Pt was vapor-deposited to 20 angstrom on the conductive substance FTO of a conductive glass support (1) to produce a platinum electrode (3).
- a paste formed from first oxide semiconductor fine particles was coated on the conductive substance FTO of a conductive glass support (1).
- the coated substrate was baked for 30 minutes at 450°C, and then dipped into a 3.2 ⁇ 10 -4 M solution of a first dye for 24 hours to produce a thin film (2a) of the first oxide semiconductor supporting the first dye.
- a paste formed from second oxide semiconductor fine particles was coated on the conductive substance FTO of a conductive glass support (1).
- the coated substrate was baked for 30 minutes at 450°C, and then dipped into a 3.2 ⁇ 10 -4 M solution of a second dye for 24 hours to produce a thin film (2b) of the second oxide semiconductor supporting the second dye.
- a paste formed from first oxide semiconductor fine particles was coated on the conductive substance FTO of a conductive glass support (1).
- the coated substrate was dried for 30 minutes at 170°C, and then a paste formed from second oxide semiconductor fine particles was coated thereon.
- the coated substrate was baked for 30 minutes at 450°C, and then dipped into a 3.2 ⁇ 10 -4 M solution of a first dye and a 3.2 ⁇ 10 -4 M solution of a second dye for 24 hours each to produce a thin film (2a) of the first oxide semiconductor supporting the first dye and a thin film (2b) of the second oxide semiconductor supporting the second dye.
- a paste formed from third oxide semiconductor fine particles was coated on the conductive substance FTO of a conductive glass support (1).
- the coated substrate was baked for 30 minutes at 450°C, and then dipped into a 3.2 ⁇ 10 -4 M solution of a third dye for 24 hours to produce a thin film (2c) of the third oxide semiconductor supporting the third dye.
- they were pasted to each other by a sealing agent (5) so that they opposed each other with a platinum mesh or carbon mesh (3) sputtered with platinum between them.
- An iodine charge transport layer (4) was charged between (2a) and (2b), and (2c) from an injection aperture (not shown) of the charge transport layer (4). Then, the injection aperture was sealed with a sealant to obtain the solar cell (E) according to the present invention.
- a paste formed from first oxide semiconductor fine particles was coated on the conductive substance FTO of a conductive glass support (1).
- the coated substrate was dried for 30 minutes at 170°C, and then a paste formed from second oxide semiconductor fine particles was coated thereon.
- the coated substrate was baked for 30 minutes at 450°C, and then dipped into a 3.2 ⁇ 10 -4 M solution of a first dye and a 3.2 ⁇ 10 -4 M solution of a second dye for 24 hours each to produce a thin film (2a) of the first oxide semiconductor supporting the first dye and a thin film (2b) of the second oxide semiconductor supporting the second dye.
- a paste formed from third oxide semiconductor fine particles was coated on the conductive substance FTO of a conductive glass support (1).
- the coated substrate was baked for 30 minutes at 450°C, and then dipped into a 3.2 ⁇ 10 -4 M solution of a third dye for 24 hours to produce a thin film (2c) of the third oxide semiconductor supporting the third dye.
- they were pasted to each other by a sealing agent (5), and an iodine charge transport layer (4) was charged between (2a) and (2b) from an injection aperture (not shown) of the charge transport layer (4) between both electrodes. Then, the injection aperture was sealed with a sealant to obtain the solar cell (F) according to the present invention.
- a paste formed from first oxide semiconductor fine particles was coated on the conductive substance FTO of a conductive glass support (1).
- the coated substrate was dried for 30 minutes at 170°C, and then a paste formed from second oxide semiconductor fine particles was coated thereon.
- the coated substrate was baked for 30 minutes at 450°C, and then dipped into a 3.2 ⁇ 10 -4 M solution of a first dye and a 3.2 ⁇ 10 -4 M solution of a second dye for 24 hours each to produce a thin film (2a) of the first oxide semiconductor supporting the first dye and a thin film (2b) of the second oxide semiconductor supporting the second dye.
- a paste formed from third oxide semiconductor fine particles was coated on the conductive substance FTO of a conductive glass support (1).
- the coated substrate was baked for 30 minutes at 450°C, and then dipped into a 3.2 ⁇ 10 -4 M solution of a third dye for 24 hours to produce a thin film (2c) of the third oxide semiconductor supporting the third dye.
- they were pasted to each other by a sealing agent (5), and an iodine charge transport layer (4) was charged between (2a), (2b) and (2c) from an injection aperture (not shown) of the charge transport layer (4) between both electrodes. Then, the injection aperture was sealed with a sealant to obtain the solar cell (G) according to the present invention.
- a paste formed from first oxide semiconductor fine particles was coated on the conductive substance FTO of a conductive glass support (1).
- the coated substrate was baked for 30 minutes at 450°C, and then dipped into a 3.2 ⁇ 10 -4 M solution of a first dye for 24 hours to produce a thin film (2a) of the first oxide semiconductor fine particles supporting the first dye.
- a paste formed from second oxide semiconductor fine particles was coated on the conductive substance FTO of a conductive glass support (1).
- the coated substrate was baked for 30 minutes at 450°C, and then dipped into a 3.2 ⁇ 10 -4 M solution of a second dye for 24 hours to produce a thin film (2b) of the second oxide semiconductor fine particles supporting the second dye.
- Pt was vapor-deposited to 20 angstrom on the conductive substance FTO of a conductive glass support (1) to produce a platinum electrode (3). They were each pasted by a sealing agent (5), and an iodine charge transport layer (4) was charged between (2) and (3) from an injection aperture (not shown) of the charge transport layer (4) between the electrodes. Then, the injection aperture was sealed with a sealant to obtain 2 solar cells. These solar cells were arranged vertically with respect to the incident light and connected in series to obtain a solar cell (H) according to the present invention.
- a paste formed from first oxide semiconductor fine particles was coated on the conductive substance FTO of a conductive glass support (1).
- the coated substrate was baked for 30 minutes at 450°C, and then dipped into a 3.2 ⁇ 10 -4 M solution of a first dye for 24 hours to produce a thin film (2a) of the first oxide semiconductor fine particles supporting the first dye.
- a paste formed from second oxide semiconductor fine particles was coated on the conductive substance FTO of a conductive glass support (1).
- the coated substrate was baked for 30 minutes at 450°C, and then dipped into a 3.2 ⁇ 10 -4 M solution of a second dye for 24 hours to produce a thin film (2b) of the second oxide semiconductor fine particles supporting the second dye.
- a paste formed from third oxide semiconductor fine particles was coated on the conductive substance FTO of a conductive glass support (1).
- the coated substrate was baked for 30 minutes at 450°C, and then dipped into a 3.2 ⁇ 10 -4 M solution of a third dye for 24 hours to produce a thin film (2c) of the second oxide semiconductor fine particles supporting the third dye.
- Pt was vapor-deposited to 20 angstrom on the conductive substance FTO of a conductive glass support (1) to produce a platinum electrode (3).
- Example Number Cell Semiconductor Layer Number Oxide Semiconductor Dye Voc/V Electrolytic Solution Example 14 A (2) Mg(0.05) S-1 0.91 B Example 15 A (2) Mg(0.10) S-1 1.01 B Example 16 A (2) Mg(0.15) S-1 0.91 B Example 17 A (2) Mg(0.20) S-1 0.95 B Example 18 A (2) Ca(0.10) S-1 0.90 B Example 19 A (2) Ca(0.20) S-1 0.89 B Example 20 A (2) Ca(0.30) S-1 0.93 B Example 21 A (2) Sr(0.10) S-1 0.92 B Example 22 A (2) Mg(0.05) S-2 0.86 B Example 23 A (2) Mg(0.10) S-2 0.91 B Example 24 A (2) Mg(0.15) S-2 0.89 B Example 25 A (2) Mg(0.20) S-2 0.88 B Example 26 A (2) Ca(0.10) S-2 0.87 B Example 27 A (2) Ca(0.20) S-2 0.87 B Example 28 A (2) Ca(0.30) S-2 0.87 B Example 29 A (2) Sr(0.10) S
- a solar cell with a higher voltage can be obtained.
- voltage can be improved with a small surface area without widening the surface area of the solar cell.
- a solar cell in which a high voltage can be obtained with a small surface area is suitable for portable applications such as in mobile phones and desktop calculators, or various applications for various kinds of display, such as liquid crystal, electroluminescence (EL), plasma display (PDP), and electronic paper (DP), which require a high voltage to drive them.
- EL electroluminescence
- PDP plasma display
- the solar cell according to the present invention such products may be made lighter and more compact.
- power charging applications such as lithium ion secondary batteries, nickel-hydrogen secondary batteries, capacitors, and condensers, high-voltage power charging can be carried out with little energy loss.
- Example 70 and Comparative Example 15 an improvement in short-circuit current as a result of using the composite oxide of the present invention instead of titanium oxide as the semiconductor for the short-wavelength region was seen for the parallel structure solar cell (D). Based on this, the solar cell according to the present invention can also improve short-circuit current and obtain a large current with a small surface area.
- tandem solar cell can exhibit sufficient effects for either the 2 cell type or the 3 cell type structure, and that such a tandem solar cell is an excellent solar cell.
- tandem solar cells were fabricated which combined photoelectric conversion elements for the short-wavelength region and the medium-wavelength region (photoelectric conversion elements fabricated using a porous substrate supporting a dye having a maximum absorption wavelength in the short-wavelength region or medium-wavelength region).
- tandem solar cells were fabricated by combining photoelectric conversion elements for the short-wavelength region, the medium-wavelength region, and the long-wavelength region (a photoelectric conversion element fabricated using a porous substrate supporting a dye having a maximum absorption wavelength in the short-wavelength region, and a photoelectric conversion element fabricated using a single sheet of a porous substrate supporting dyes having a maximum absorption wavelength in the medium-wavelength region and the long-wavelength region on either respective face of the substrate).
- these photoelectric conversion elements for the short-wavelength region, the medium-wavelength region, and the long-wavelength region are not especially limited to such a combination.
- the tandem solar cell may be fabricated using any combination thereof. Thus, a solar cell using any combination is included in the present invention.
- the dyes used for the short-wavelength region in the examples are illustrated below.
- the dyes used for the medium-wavelength region in the examples are illustrated below.
- the dyes used for the long-wavelength region in the examples are illustrated below.
- the solar cell according to the present invention is effectively utilized over a wide field as a solar cell with a high conversion efficiency, especially the conversion efficiency in the short-wavelength region and the long-wavelength region.
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PCT/JP2007/063371 WO2008004580A1 (fr) | 2006-07-05 | 2007-07-04 | Cellule solaire sensible à la coloration |
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CN (1) | CN101485036B (fr) |
AU (1) | AU2007270404B2 (fr) |
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- 2007-07-04 US US12/227,993 patent/US20090242027A1/en not_active Abandoned
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Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
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EP2385556A1 (fr) * | 2010-05-04 | 2011-11-09 | Heliatek GmbH | Composant photo-actif doté de couches organiques |
WO2011138021A3 (fr) * | 2010-05-04 | 2011-12-29 | Heliatek Gmbh | Composant photoactif à couches organiques |
US9024181B2 (en) | 2010-05-04 | 2015-05-05 | Heliatek Gmbh | Photoactive component comprising organic layers |
EP2833471A4 (fr) * | 2012-03-30 | 2015-12-23 | Adeka Corp | Cellule solaire sensibilisée par un colorant et procédé de fabrication de cette dernière |
US10032568B2 (en) | 2014-04-09 | 2018-07-24 | National Chung Hsing University | Photosensitive organic dyes for dye-sensitized solar cells |
EP3499531A4 (fr) * | 2016-08-12 | 2019-08-14 | Sharp Kabushiki Kaisha | Batterie solaire sensibilisée aux colorants et procédé pour sa fabrication |
US10727412B2 (en) | 2016-08-12 | 2020-07-28 | Sharp Kabushiki Kaisha | Dye-sensitized solar cell and method for producing the same |
US11017957B2 (en) | 2016-08-12 | 2021-05-25 | Sharp Kabushiki Kaisha | Dye-sensitized solar cell |
Also Published As
Publication number | Publication date |
---|---|
US20090242027A1 (en) | 2009-10-01 |
KR20090037867A (ko) | 2009-04-16 |
JP5084730B2 (ja) | 2012-11-28 |
CA2655192A1 (fr) | 2008-01-10 |
JPWO2008004580A1 (ja) | 2009-12-03 |
CN101485036B (zh) | 2012-07-04 |
EP2037528A4 (fr) | 2009-08-19 |
WO2008004580A1 (fr) | 2008-01-10 |
AU2007270404B2 (en) | 2011-04-28 |
TW200818576A (en) | 2008-04-16 |
AU2007270404A1 (en) | 2008-01-10 |
KR101341299B1 (ko) | 2013-12-12 |
CN101485036A (zh) | 2009-07-15 |
TWI407616B (zh) | 2013-09-01 |
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